Persistence

摘要： The CPU can also be managed to save energy. A notebook CPU can be put to sleep in software, reducingpower usage to almost zero. The only thing it can ... 阅读全文

摘要： Another major villain is the hard disk. It takes substantial energy to keep it spinning at highspeed, even if there are no accesses. Many conputers, e... 阅读全文

摘要： The operating system plays a key role in energy management. It controls all the devices, so itmust decide what to shutdown and when to shut it down. I... 阅读全文

摘要： The general approach most computer vendors take to battery conservation is to design the CPU,memory, and I/O devices to have multiple states: on, slee... 阅读全文

摘要： The first general-purpose electronic comuter, the ENIAC, had 18,000 vacuum tubes andconsumed 140,000 watts of power. As a result, it ran up a non-triv... 阅读全文

摘要： Over the years, the main computing paradigm has oscillated between centralized and decentralizedcomputing. The first computers, such as the ENIAC, wer... 阅读全文